If you've never hear of this, you haven't had to ask of others how to solve a bacterial infection on seahorses, or, you haven't been in the hobby long enough and on the right place for information.
Been in the hobby ~15 years, with almost no experience with seahorses. With some reading, I see it is commonly suggested to drop temp on seahorses with Vibrio.
Usually, messing with temp just causes more stress to what we keep, and I hadn't seen that suggested before. That's why I asked.